Safeguard Engine Commands - D-Link DES-1228/ME Reference Manual

Periodically, malicious hosts on the network will attack the Switch by utilizing packet flooding (ARP Storm) or other methods.
These attacks may increase the CPU utilization beyond its capability. To alleviate this problem, the Safeguard Engine function
was added to the Switch's software.
The Safeguard Engine can help the overall operability of the Switch by minimizing the workload of the Switch while the attack is
ongoing, thus making it capable to forward essential packets over its network in a limited bandwidth. When the Switch either (a)
receives too many packets to process or (b) exerts too much memory, it will enter an Exhausted mode. When in this mode, the
Switch will perform the following tasks to minimize the CPU usage:
It will limit bandwidth of receiving ARP packets.
It will limit the bandwidth of IP packets received by the Switch.
IP packets may also be limited by the Switch by configuring only certain IP addresses to be accepted. This method can be
accomplished through the create trusted_host explained in the previous section. Once the user configures these acceptable IP
addresses, other packets containing different IP addresses will be dropped by the Switch, thus limiting the bandwidth of IP packets
The Safeguard Engine commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command
config safeguard_engine
show safeguard_engine
Each command is listed, in detail, in the following sections.
DES-1228/ME Metro Ethernet Managed Switch CLI Reference Guide
Parameters
{state [enable | disable] | utilization {rising <value 20-100> | falling <value
20-100>} (1) | trap_log [enable | disable] | mode [strict | fuzzy]} (1)
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